Materials Literature
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In this work the reactions taking place during melt mixing of bisphenol-A polycarbonate (PC) with poly(ethylene terephthalate) (PET) were studied by selective degradation of PC sequences, solubility tests, and IR spectroscopy. It was found that exchange reactions between PC and PET took place, contrary to what has bee…
Polyaniline, (4oSN) is found to exhibit a low energy absorption edge beginning near 1800 cm−1 (ca: 0.22 eV), and a strong anion-induced absorption from about 800 to 1200 cm−1. Electrical conductivity has an activation energy of 0.05 (15%) eV consistent with an anion-induced energy gap of about 0.1 eV.
The theoretical basis for the use of paramagnetic agents to enhance proton relaxation is described. Factors of importance in the design of contrast agents are considered. Measurements of changes in T1 and T2 in vitro due to Gd3+-diethylenetriamine pentaacetic acid (DTPA) are used to predict changes in the intensity of…
Gadolinium-DTPA complex (Gd-DTPA) is a potential clinical magnetic resonance (MR) contrast agent that enhances images primarily by decreasing spin-lattice relaxation time (T1) in tissues in which it localizes. This study was designed to determine the immediate tissue distribution of intravenously administered Gd-DTPA…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Joseph L. Horner and James R. Leger, "Pattern recognition with binary phase-only filters," Appl. Opt. 24, 609-611 (1985) Export Citation BibTex Endnote…
The dc conductivity of hexagonal boron nitride (BN) and BN‐containing composites was measured as a function of temperature up to 2400°C. The results confirm that at high temperatures BN is an intrinsic semiconductor with an energy gap of 0.99 ± 0.06 aJ (6.2 ± 0.4 eV) at T = 0 K. Extrapolated values for the resistivity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR spectroscopic study of S = 1, 2, and 3 spin states of tris(.mu.-hydroxo)-bridged chromium(III) dimersStefan KremerCite this: Inorg. Chem. 1985, 24, 6, 887–890Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1 March 198…
In photoelectrochemical (PEC) cells based on single junctions of semiconductors with solutions or metals, photopotentials are rarely above 0.6–0.8V. The higher photovoltages needed to drive more energetic reactions require multijunction cells involving multilayer electrodes or series connection of PEC cells. Such PEC…
Abstract With respect to the behavior of Nuclear Pressurized Water Reactor fuel cladding during accidents the oxidation kinetics of Zircaloy‐4 tubing in steam and the related changes in the mechanical properties have been investigated. Short tube sections were exposed to steam between 600 and 1600°C under isothermal a…
Electrochemically active aluminum can be cathodically deposited and anodically stripped from acidic mixtures of 1‐methyl‐3‐ethylimidazolium chloride and aluminum chloride at room temperature. The rates of deposition can be high (25 mA/cm 2 ), and the deposited aluminum can be quantitatively cycled in large amounts (>2…
Abstract Among the perovskite-type oxides examined, SrTiO3 showed a high sensitivity to oxygen in the “lean-burn” region. The resistivity characteristics of the specimen were also investigated in the exhaust gas of propane-oxygen combustion. SrSnO3 is promising for a combustion monitoring sensor.
SUMMARY A mathematical model for soil profile evolution is developed in three parts; respectively for the weathering profile, the organic profile and for the inorganic profile associated with nutrient cycling. Processes modelled are percolation, equilibrium solution, leaching, ionic diffusion, organic mixing, leaf fal…
Two highly purified syntrophic associations resulting in acetogenesis from stearate (SM) and oleate (OM) were obtained from the sludges of a sewage digestor. In both cases, Methanospirillum hungatei together with short, motile, gram-negative, nonfluorescent rods morphologically similar to Syntrophomonas wolfei were id…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors favoring an M...H-C interaction in metal-methyl complexes. An MO analysisOdile Eisenstein and Y. JeanCite this: J. Am. Chem. Soc. 1985, 107, 5, 1177–1186Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1 March 1985…
The thickness of natural air-formed oxides on Al, Si, Fe, Ni, and Ta is determined by Auger electron spectroscopy (AES), depth profiling, and angle-resolved photoelectron spectroscopy (XPS). The sputter rate of the oxides is measured under the same conditions and their values are given with respect to a certified stan…
The synthesis is described and the mesomorphic properties have been tested for two homologous series of compounds with the isothiocyanato (-NCS) terminal group: 4-(trans-4′-n-alkylcyclohexyl)isothiocyanatobenzenes (CHBT—formula 1) and 5-trans-n-alkyl-2-(4′-isothiocyanatophenyl)-1,3-dioxans (DBT—formula 2). CHBT are ne…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization and activity of some mixed metal oxide catalystsTetsuro Seiyama, Noboru Yamazoe, and Koichi EguchiCite this: Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 1, 19–27Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published iniss…
The mechanical behaviour of a Ti50Ni47Fe3 alloy, which exhibits a well-defined premartensitic transition and a subsequent martensitic transformation, was studied systematically using tensile tests over a wide temperature range covering M s to above T R. Two-stage yielding was observed in the temperature range between…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic formation of hydrogen and carbon-carbon bonds on illuminated zinc sulfide generated from zinc dithiolenesN. Zeug, J. Buecheler, and Horst KischCite this: J. Am. Chem. Soc. 1985, 107, 6, 1459–1465Publication Date (Print):March 1, 1985Publication History Published on…
We have identified in Bacillus subtilis an analogue of the Escherichia coli RecA protein. Its activities suggest that it has a corresponding role in general genetic recombination and in regulation of SOS (DNA repair) functions. The B. subtilis protein (B. subtilis Rec) has a Mr of 42,000 and cross-reacts with antisera…